The shapes of overflow weir plates are straight and toothed; what is the difference between the two, and how should one choose?
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The shapes of overflow weir plates are straight and toothed. What is the difference between the two, and how should one choose between them? What are their respective applications?
Toothed weirs are suitable for systems with low liquid volumes and high surface tension!
Under normal circumstances, when the liquid head above the weir is less than 6 mm, the overflow becomes unstable and deviation in flow is likely to occur (the weir cannot be perfectly horizontal), resulting in an uneven distribution of the liquid layer on the plate and thus affecting the efficiency of the tray. In such cases, a toothed weir should be used.
The straight-type you’re referring to must be something like the Great Wall; we usually call it a barrier dam. Just like the triangular toothed weirs, there is no particular difference; they are all used in situations where the overflow capacity is relatively low. Speaking of differences, it might be in terms of processing – the Great Wall Weir is probably easier to work with
What is the formula for calculating the height of an overflow weir?
The height of the overflow weir is generally selected, rather than calculated. The common height of an overflow weir is 50 mm.
The height of the overflow weir is generally 50 mm, and the tooth depth is generally 15 mm.